Laptop GPU reflowing- help needed

Hi I want to reflow the gpu on my only laptop by myself, I can't trust repair center or can't effort a new laptop .

I kind of bent the main board so this happened.

Question : I want to reflow gpu using heat gun and laser thermometer for measurement , what's the best melting temperature for it? I saw people go up to 260 but I usually solder joints melt at 200-210 Celsius , so I'm wondering if lower temperature will reduced the risk of burning the gpu completely…